Scelta multipla
Deuterium is an isotope of hydrogen with a mass number of 2. Which of the following correctly describes a deuterium atom?
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2. Atoms & Elements
Isotopes
Scelta multipla
How many protons are present in the isotope lithium-6?
A
6
B
4
C
3
D
2
Guida verificata passo dopo passo1
Recall that the number of protons in an atom is defined by its atomic number, which is unique to each element.
Identify the element in question: lithium. Lithium has an atomic number of 3, meaning it has 3 protons.
Understand that the isotope notation lithium-6 indicates the mass number, which is the sum of protons and neutrons, but does not affect the number of protons.
Therefore, regardless of the isotope (lithium-6 or lithium-7), the number of protons remains the same as the atomic number of lithium, which is 3.
Conclude that the number of protons in lithium-6 is 3.
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